Pirate Mfg Black 40,000 Volt Ignition Coil 12 Volt Street Hot Rat Rod HEI GM Ford V8 Muscle Universal 40,000 Volt Black Ignition Coil. 12V Coil is designed to be used with HEI applications, includes a black mounting bracket and has a 40,000 Volt output. This oil filled coil offers more spark and volts, smoother response and better economy than OEM. Get that great Old School look on your Rat Rod, Hot Rod, Street Rod, Muscle Car, or Custom. Low (.6 Ohms) Resistance